"
This series implements the backlog tracker for TWCS, allowing it to
be controlled. The backlog for a TWCS colum family is just the sum of
the SizeTiered backlogs for all the windows that we know about.
A possible optimization for this is to stop tracking windows after
they become old enough and revert to zero backlog. I reverted that
last minute, though, since this will probably cause the backlog to
completely misrepresent reality if we import SSTables into old buckets
with things like repairs or nodetool refresh.
"
* 'twcs-backlog-v4.1' of github.com:glommer/scylla:
backlog: implement backlog tracker for the TWCS
STCS_backlog: allow users to query for the total bytes managed
backlog: keep track of maximum timestamp in write monitor
memtable: also keep track of max timestamp
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